Investigators have scoured the crime scene of the Boston Marathon bombing for every possible physical clue. A crucial task is to collect as many bomb fragments as possible, to track where the parts came from and who bought such items.
Federal authorities late Monday removed several bags from an apartment in a nearby suburb. Police investigating the Boston Marathon bombing have also issued an alert for a rental van and for a hooded man who left the area before the blasts.
The survivalist movement is aimed toward apocalypse and social meltdown. But for some, the end game is one of their own making, as seems to be the case with accused murderer Peter Keller, holed up in an earthen fort.